Cartridge for an electronic pen



FIG. 1 is a front-bottom-right perspective view of a cartridge for an electronic pen according to my new design;

FIG. 2 is a rear-top-left perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines in the figures depict portions of the cartridge for an electronic pen that form no part of the claimed design. 

CLAIM The ornamental design for a cartridge for an electronic pen, as shown and described. 